28134779 has 4 divisors (see below), whose sum is σ = 29789784. Its totient is φ = 26479776.

The previous prime is 28134767. The next prime is 28134781. The reversal of 28134779 is 97743182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28134779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28134709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 827477 + ... + 827510.

It is an arithmetic number, because the mean of its divisors is an integer number (7447446).

Almost surely, 2^28134779 is an apocalyptic number.

28134779 is a deficient number, since it is larger than the sum of its proper divisors (1655005).

28134779 is a wasteful number, since it uses less digits than its factorization.

28134779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655004.

The product of its digits is 84672, while the sum is 41.

The square root of 28134779 is about 5304.2227517328. Note that the first 3 decimals coincide. The cubic root of 28134779 is about 304.1453418298.

The spelling of 28134779 in words is "twenty-eight million, one hundred thirty-four thousand, seven hundred seventy-nine".